Bob,
I've had many battles with DTMF transmission, I use automated dialing
which upon completion of the call requires 10-28 dtmf digits to be sent
down the wire. There are a bunch of variables that come into play:
- What codec are you using ( more issues w 729 )
- who is doing your termination ( inband, outband )
- where is the end termination destination and in turn who is last
mile provider ( many headaches into AB & NB )
- what are your dtmf settings all along the way. Phone, ATA, Asterisk.
I ran into issues with any carrier that was using MCI to get into
Alberta and New Brunswick. Not sure who MCI is using in those markets
but I also had the same issue with Vonage into Alberta but not NB. Also
had some spotty issues in 519 ( Sarnia was where I was calling ).
Presently using Voxee with no DTMF issues to anywhere. I'm using Polycom
phones and Sipura 2000's & pap2's I've got all configure with DTMF as
auto, both on the device and in my asterisk box. In the US and 416 I
have no issue with 729 but those other markets it would just not work on
the carriers I was using. By mainly using 711 and finding a reliable
carrier with the right partner for termination I now have no issues.
Hope this helps a bit?
Mike
Bob Cai wrote:
SIPphone --> asterisk --> h323 proxy --> remote callee
1. gets ring back tone
2. connects and hears automated attendant greeting
3. dial extension(RFC2833, payload 101), but is not received correctly
by remote side
anyone can help? thanks.
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